Door lock for elevator shafts



June 3,1924, 1,496,477

I S. L. MCKINNEY DOOR 'LOCK FOR ELEVATOR SHAFTS .Filed Feb. 19, l

I N VEN TOR.

\, I I y A TTORNEY.

Patented dune 3, 1324.

SAMUEL L. MCKINNEY, OF IEORIA, ILLINOIS.

DOOR LOOK FOR ELEVATOR SHAFTS.

Application filed February 19, 1823. Serial No. 619,833.

To all whom it may concern.

Be it known that I, SAMUEL L. MCKINNEY, a citizen of the United States, residing at Peoria, in the county of Peoria and State of Illinois, have invented new and useful Im provements in Door Looks for Elevator Shafts; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to safety appliances for passenger and freight elevators.

More particularly the invention relates to means for locking the elevator-shaft door and the control-lever of the cageor car.

The object of the present invention is to combine with the door-locking mechanism of my prior Patent No;1,1 14,965, issued June 29, 1915, certain parts for locking such mechanism when the door has been closed, or all but closed, so that said door cannot be opened, even though the cage or car maybe in position to receive ,or discharge passengers, except at the will of the operator. An object also is to include a construction as an advantage not resident in my copending patent application Serial Number 538,123 filed Feb. 18, 1922. a

While my present invention is not required in elevator installations in general yet the laws of certain States governing elevator-lock structures demand a device having such advantages as the invention to be described possesses.

In the appended drawing,

Figure 1 is an elevation of parts of an elevator-shaft door endear, together with the device of my invention as applied to the door locking mechanism illustrated, and,

Figure 2 is an elevation of a part of the mechanism shown in Figure 1 muchjenlarged; p

Alanding floor is designated at 1, the door at 2, and a door guide-track on thefioor at 3, while 4 indicates part of an elevatorcar as viewed bya person standing upon the floor 1.

In the two figures, 5 represents a case mounted on the floor 1 between the door 2 and the elevator-shaft, pivoted within which is a forked lever6 to receive into it a roller 7 carried by said door. 7 I

The fork of the lever lies outside the case While the other end within the latter is formed with a toothed sector 8 with which at times a weighted pawl 9 engages, the latter being pivoted within said case. A coil spring 10 is attached at one end to the pawl and its other end is secured on a pin 11 in said case, said spring constantly tending to move the pawl toward the teeth of said sector 8.

Erected upon the floor 1, also, is a standard12 supporting a slidable bar 13 operatively connected with the fork 6.by a rod 14: pivoted at its ends to each, while 15 is a block secured upon the bar 13 and provided with a roller 16. V

Said standard 12 also carries a bar 17 slidable therein, a rod 18 connecting it with the pawl 9, the said bar carrying a block 19 provided with a roller 20.

Secured upon the outer surface of the wall of the car 4 is a bracket 21having the general form of a hollow square in this instance, the two vertical legs thereof slidably' carrying a pairrof spaced rods 22. Secured upon the rods in a vertical position, is a shoe or striker-plate 23, coil springs on the rods being compressed between the'shoe and one of the legs and tendingatfall tiniesto move the shoe to the left as seen in Figure 1.

A bell-cranklever 25 is pivotedon the car and one arm thereof has operative connection with the shoe 23 by means of a rod 26, and attached to the other arm is a rod 27 which extends through the wall of the car, terminating in a rack-bar 27 engaging a pinion 27 2 on a rock-shaft 27 Slidable in the described bracket'21 is a pair of rods 28 carrying a shoe or strikingplate 29. A pin 30 is secured in the shoe and extends through a slot, not shown, in the wall of the car, a rod 32 connecting the pin with one arm of a bell-crank lever 33. The other arm of the lever is attached to a rod 34 of a part operated by the control-lever 34 which is suitably pivoted on the car to swing laterally, being prevented at times from so doing by a pair of ears 27 on the described rock-shaft 27. The said rod 34 carriesa cross head 34: which is engaged and depressed by a roller 34 on said lever 34 ,Thus far described the apparatus conforms to what has been shown in my said pending application and my patent herein referred to, but I shall now describe parts that are also shown in said pending application but which herein have a slight rearrangement and resulting advantage in use and which will form the subject of the claims herein.

At 35 is a trigger pivoted between its ends at 36 in the case 5. Its lower extremity is made to extend alongside the pawl 9 and has a slot 36 into which extends a pin 87 carried by said pawl. The opposite end of the trigger in one of its positions is made to extend beyond a series of teeth or abutments 38 at the top of the case 5 to form a lodgement for a dog 39 pivoted to the forked lever 6.

In said copending application the trigger Weighted at its lower end and gravity, therefore, is depended upon in the performance of some of the duties of said trigger.

But in order that a more positive action of the apparatus may be had I employ physical connection of the said pawl and the said trigger, i. e. and operative engagement of these parts. The drawing shows the door 2 in it's closed position. By reason of the fact that the ear 4 is shown at a landing the shoe 23, which travels with the car, has engaged the roller 20 of the bar 17 shifting it to the right to remove the pawl 9 from the sector 8,,,and the path of travel of the same, permitting the door to be moved to the right to open it. I

In the figure, however, the door has been opened and closed but cannot again be opened due to the fact that the dog, 39 is supported by the trigger 35 as a fourth tooth so to speak. That is to say, when the shoe 23 is not engaging the roller 20, the car being thenbetween landings, the trigger 35 lies within the case 5, the dog 39 being free to drop and to hang as shown in Figure 2. When, therefore, the car arrives at the landing the said dog may drag to the right over the teeth or abutinents 38, see dotted lines in said Figure 2, as the door is opened after movement has been imparted to the pawl 9 to release the lever 6. This ability of the dog to thus drag is occasioned by the fact that while the said pawl has been moved to release said lever 6 and the trigger has been extended beyond the case 5 toward said dog, said dog having been previously released can' dragbver said teeth. Now, as the door is again closed the dog drags back over the teeth in the other direction and must lodge upon the trigger as the lever 6 comes to rest at its limit of movement toward the left. An attempt to again open the door is thwarted since the dog is then in position to strike one of the teeth or abutments' 38. However, the operator by a movement of the starting or control-lever, not

shown, may move the shoe 23 away from the roller sufficiently to permit the pawl 9 due to its spring 10 to rise far enough to operate the trigger to let the dog drop whereupon the door can be opened.

The pivots of the pawl 9 and the trigger 35 areso placed, relatively, andthe form of the slot 86 in the latter is so shaped and disposed that the arcuate movement of the said pawl will, in a downward movement, project the trigger beyond the case and in a raising movement retract the same.

In the event that the spring 10 becomes broken the door cannot be opened until a new one is substituted.

It is clear that I may use other types of connection between the pawl and trigger for providing for the positive action of the trigger since it is not my purpose to confine myself to the type shown and described.

I claim:

1. In mechanism of the nature described, in combination, a door, a support, a dooroperated lever mounted on a said sup port, one of the two last named elements having an abutment thereon, the other having a dog pivoted thereon to engage the abutment, a trigger for supporting the dog in position to meet the abutment, the two latter preventing movement of the lever, and manually operated means operati'vely connected with the trigger 'for withdrawing the same from beneath the said dog.

2. In mechanism of the nature described, in combination, a door, a support, a dooroperated lever mounted on said support, one of the two last named elements having an abutment thereon, the other having a dog pivoted thereto having a free end, a trigger arranged to support the "free end of the dog for holding it in position to engage the abutment in the movement of the lever in one direction, an elevator-car, and mechanism operated from within the car for actuating the trigger including a part operatively connected with the latter adapted to operate that member in either of two directions.

3. In mechanism of the nature described, in combination with a lever adapted to be engaged and swung by a door, a dog carried by the lever, an abutment in the path of the dog, a trigger also in the path of and adapted to support the said dog free of the abutment, and manually operated means opera: tively connected with the trigger for moving it into and out of the path of movement of the dog.

4. In mechanism for locking the door of an elevator-shaft, the combination with the shaft-door, a lever mounted on the building floor adapted to be moved in two directions in the opening and closing movements of the door, and an elevator-car havinga manually controlled part, of a dog pivotally mounted on the lever, the same having a free end, an abutment in the path of the dog, a trigger adapted fors'upporting the free end of the dog in position to meet said abutment and prevent movement of the door in one direction, and a part operatively connected to the tri'g ger for moving it positively into and out of the path of the dog,

the same being operated by the said manually controlled part.

5. In mechanism for locking the door of an elevator-shaft the combination with the door, a pivotally mounted lever on the landing-floor at said shaft adapted to be swung by the door, an elevator, and a manually controlled device thereon, of a dog pivotally mounted on the lever adapted to hang freely from its point of support, an abutment lying in the path of the dog, a trigger adapted in one of its positions to lie in said path of the dog and to support the same in position to meet the abutment and thereby prevent the lever being moved in a direction to permit the door to be opened, and means operated by the said manually controlled device operatively connected with the said trigger to operate it to move it into and out of the said path of the dog.

6. In mechanism of'the nature described, in combination with a lever adapted to be engaged and swung by the door of an elevator-shaft, a dog carried by the lever, an abutment in the path of the dog, a pivotally mounted trigger at said abutment adapted to be moved into and out of the said path of said dog adapted in one .of its positions to support the dog upon it, and. manually operated pivotally mounted means having a pin, the trigger having a slot therein receiving the pin and so disposed with respect to the pivot of the said trigger and the pivot of said means that said trigger will be moved in opposite directions of movement of said means.

7. In mechanism of the nature described, in combination with a lever adapted to be engaged and swung by the door of an elevator shaft, a dog carried by the lever, an abutment in the path of the dog for preventing the movement of the lever in one direction, a trigger arranged to be projected into the path of the dog and to support the same thereon for guiding it against the abutment, and manually operated pivotally mounted means operatively engaging the trigger, the latter and said means each being fashioned and adapted to cooperate in a manner whereby in the pivotal movement of the said means the trigger will be moved into and out of the path of the dog.

In testimony whereof I affix my signature in presence of two witnesses.

SAMUEL L. MCKINNEY Vvitnesses:

J. H. KINGSBURY, L. M. THURLOW. 

